Combination tire valve-stem and pressure-gage.



1). C. HATHAWAY. COMBINATION TIRE VALVE STEU AND PRESSURE GAGE.

APPLICATION FILED JUNE 19, 1912.

Patented Nov. 25, 1913.

O Attorneys N TED Subir-WENT oFFIoE.,

DAMAS 0. RATHLWAY, OF SEEI'IDON, ILLINOIS.

@MBNATIQN TIRE. VALYESTW AND PEESSURE-GAQE.'

l Specification of Letters Patent,

Application filed June 19, 1912. Serial No. 704,649.

To oll'cvfwm t ma concern;

Be 1t known tot L DALLAS. C. RATHA- WAY, ab citizen ofthe United Steitesgesding Among its other objects, this invention.

time to provide t device ot character indicated, which shall be simple, c, ct funiv lwxpensivo in construction; w ich shell be convenient, servicentde and etlicient iu use and whloh. Shell not enf-:umher the velue stem; and which may be employed similarly to preSBnt valve or barrels,

.With the foreoing generalI 'ob'ncctsout lined, and other o ieots in view, w ich shell be u. parent. as Invention isbetter limiter-` stoo the invention residesA in the combi` n. mi and arrangement lof. paints end in the details et construction hereinafter described and claimed. it being understood that che-uws, in the precise embodiment ci the; invention herein disclosed con be mdc within the scope otwbat is claimed, With.- out depfvrting rem the spirit of the invention..

The preferred embodiment ot the invention vbins been illustrated in the MBDYHPMW* ing drawings, wherein:-

Fignre 1 is e side elevation et the valve stern usconsmueted in accordance withA the present invention. Fig, 2' is u. longitudinal control section thereof. Fig. 3 is a bottomY view.

leterrimg speciicuflly ,f0.1 the drawings, the vulvev stem is ci the general .formation es employed in the present doy tor attach-v meer te the inner tubes ci; automobile, bicyclo or. other tutos Stom 0r borrel her-.1re oxtornolty .threaded per tion 6 which is adapted to pass inwardly througli the rim or felly of the wheel end which 1s attened at opposite sides, as usual, and u reduced circular portion 5 beyond the portion 6L the ti 1Q at the outer end of the portion 5, which 1s externally and internally screwthreegled., A check valve of any Standard or suitable construction may be enga, ed inthe tip 10, and a suitable cap may gaedover the seid.' tip. so as to close the The valve stem or barrel has Patented NOV.25, 1913'.

verve When'the tire orinner tubin is not 4 bolug inlcted, said tip 10 being @Signed for the attachment ofthe pump connection YV 'en the cap is removed, for purpose of 1n @ting the il?? orA inner tubing'. At its outer epd', the. portion 601? the valve stem 1s provlded with the' usuel external (flange 7,. and a. washer 8 co' crates with` the seid flange to .clamp the tu ing2 therebetween in order to. attach the valve stem to, the tubing,

a nut 9 being engeged .on the portion 6 1n order to olaf` vthe tubing between the flange I and the Washer 8, es will be epperent.

The foregoing parts. are of the usual or stendard construction, and in carrying out t present invention, the stem orfval've is promded with er1-eccentric lnngitudinal air bore 11 extending throughout its length, or from the outer end of the portion 6 to the tip 10, the valve stem being provided with a. secondary or `nge tube bore 12 in an eccentric relation t rewith .and parallel with the bore 11, but terminating short of the tip 10. The bore 12 is providedv with a. primar and an eccentric secondary counter-bore 1Il and. 16, respectively, at its` lower end, and the side of the portion 5 adjoining the bore 12. is cut away. as designated by the numerel L3 flushwith the inner wall of the said bore, thereby roviding` a socket 14 at the upper end cip the stem, which is in 1gant the upper end or continuation of the ore 12.

A. mercury tube 17 is inserted in the bore 'or in any other suitable manner. The cut away portion 13 exposes the mercury tube 17'suiiiciently along its length for observing the rise and fall of the mercury therein, as hereinafter set forth.

A flexible diaphragm 1S) of 'any suitable material is seated within the secondary and eccentric counter-bore 1G, the said diaphragm having its edges thickened as designated by the numeral 20, so that the edges in seating against the ,shoulder formed by the secondary counter-bore will space the diaphragm 19 sufficiently downward below th'e said shoulder or the lower end of the primary counter bore 15 so that the mercury may pass below the shoulder. This diaphragm 19 is retained in position by means of a binding ring 21 screwthreaded'into the secondary counter-bore 16 and contacting with the edges of the diaphragm, the binding ring 21 being provided with internal lugs 22 for convenience in rotating the same by means of a suitable implement. The primary counter-bore 15 provides a mercury chamber wherein the mercury 23 is contained, the mercury extending up' into the tube 17 to a position at the lower end of the cut away portion 13,

^ when no pressure is applied to the dia.-

phragm 19, or under normal conditions. The upper end of the tube 17 being closed provides an air space between the level of the mercury and the upper end of the tube, so that when the diaphragm 19 is pressed upwardly by the pressure of air within the tire, the mercury column 23 within the tube 17 will be raised against the air in the upper end of the tube 17 so as to compress the airl in the upper end of the tube. In order to determine the pressure of the air within the tubing or tire, a series of graduations 24 have been provided along one side of the cut away portion 13, the level or upper end of the column of mercury 23 in the tube 17 indicating the pressure in pounds of the l air Within the tire on the graduations 24.

From-the foregoing, taken in connection with the drawings, it will appear that the valve stem may be applied to the tire in the usual fashion and may be inserted inwardly through the rim or :telly of the wheel and secured thereto, as usual. It is also apparent that any suitable valve may be provided for the valve stem, and that a cap may be engaged over the tip 10 or over the valve stem as a whole, as may be found to be beneficial or necessary. rlhen, as the inner tubing or tire is inflated, air pressure impinging on the diaphragm 19 will press the diaphragm upwardly in order to raise the column of mercury within the tube 17, so as to indicate the pressure of air on the series ofgraduations 24. In this manner, the air pressure will be at all times indif cated in order to permit the operator to observe the pressure of the air, either when infiating the tire or after the tire has been inflated, it being desirable to take the readings at a certain or predetermined position' of the wheel.

It is to be observed that the edges of the diaphragm being thickened and seating against the shoulder formed by the secondary counter bore will space the diaphragm below the said shoulder in order that the mercury may pass below the shoulder. Thus, a greater area of mercury is exposed to the pressure of the air within the tire, and as the result, the readings will be more precise.

It will be apparent that the objects aimed at are attained in a satisfactory and effective manner, and that the present valve stem or valve is a desirable one for the purposes to which it is designed, it being understood that the design, sizes, proportions, and materials of the various parts may be altered according to the dictates of convenience or eiieiency.

Having thus described the invention what is claimed is 1. A tire valve barrel having eccentric and parallel air and gage tube bores, the lower end of the latter bore having a primary aiid an eccentric secondary counterbore and the upper end of the latter bore terminating short of the tip of the barrel, a mercury tube fitting in the said bore and ,having its outer end closed and seated against the upper end of the bore, the lower end of the tube being open and entering the primary counter-bore, a packing ring in the counter-bore around the end of the tube, a diaphragm having its edges thickened and seated against the shoulder formed by the secondary counter-bore so as to space the diaphragm from the said shoulder, and a binding ring screw-threaded into the secondary counter-bore and bearing against the thickened edge of the diaphragm to retain the diaphragm in position, a portion of the valve being cut away to expose the tube and. bearing graduations.

2. A tire valve barrel having parallel air and gage tube bores, the lower end of the latter bore having a primary and a secondary counter-bore, a mercury tube itting in the latter bore, the lower end of the tube entering the primary counter-bore, a diaphragm having its edges thickened and seated against the shoulder formed by the secondary counter-bore, so as to space the diaphrugm from the said shoulder, and a ring as my own, I have hereto affixed my signangaged in the seeondarylfi colnter-bore allid ture in the presence of two witnesses.-

earing against the thic ene edge of t e diaphragm to retain the diaphragm in pos- DALLAS C' HATHAWAY 5 tion, a portion of the valve being out away Witnesses:

to expose the tube and bearing graduations. F. BURKLE,

In testimony that I claim the foregoing J. ALBA GLAssLEY. 

